JP2000110807A - Fastener device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform fastening with reliability even when large load is applied. SOLUTION: A rod member 4 penetrates through casing members 1, 2, 3 to be fastened. An upper end of the rod member 4 is engaged with an upper surface of the easing member 1 through an upper nut 6 screwed therewith. A lower end of the rod member 4, with which a lower nut 5 is screwed, is projected downward of the easing member 3. Push-up bolts 10 are screwed into bolt holes 9 formed on a peripheral edge of the lower nut 5. After screwing the push-up bolts 10, a divided spacer 11 is press-fitted into a gap between a lower washer 8 and the lower nut 5. Load is supported while being distributed by the push-up bolts 10 and the spacer 11 having a large pressure receiving area.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fastening device, and has been devised so that a member to be fastened can be reliably connected even when an extremely large static load and an extremely large impact load are applied. In particular, even when used to fasten and assemble members to be fastened of a heavy and long structure, the fastening can be performed with high reliability.

[0002]

2. Description of the Related Art A super bolt (trade name) is commercially available as a fastening device capable of obtaining a large initial tightening force with a small torque. Here, the super bolt will be described with reference to FIG.

As shown in FIG. 11, a body 03a of a bolt 03 penetrates through holes 01a and 02a formed in the superposed members 01 and 02. At this time, bolt 0
The head portion 3b of the bolt 3 contacts and engages with the surface of the member to be fastened 01, and the screw portion 03c of the bolt 03 penetrates the member to be fastened 02 and protrudes to the outside.

[0004] Of the screw portion 03c of the bolt 03, a portion protruding outside the member to be fastened 02 is provided with a nut member 0c.
4 is screwed. Bolt holes 04b parallel to the nut holes 04a are formed at a plurality of positions along the circumferential direction in the peripheral portion of the nut member 04. Jack bolts 05 are screwed into the respective bolt holes 04b.

Further, a flat washer 06 is interposed between the nut member 04 and the member 02 to be fastened.

In the above configuration, when the jack bolts 05 are tightened, the jack bolts 05 generate a force for pressing the flat washers 06.
1 is urged toward the head 03b (upward). The nut member 04 is urged downward and the trunk portion 03a is urged downward in the drawing as a reaction force of the force by which the jack bolt 05 pushes the flat washer 06. As a result, the members 01 and 02 to be fastened by the head portion 03b.
Is urged toward the nut member 04 (downward). Thus,
The members to be fastened 01 and 02 are pressed from above and below and fastened.

[0007] Since the members to be fastened 01 and 02 are fastened by the resultant of the fastening force of the jack bolts 05, they can be extremely firmly fastened. On the other hand, the tightening force of each jack bolt 05 may be small. As a result, even if the fastening force of each jack bolt 05 is small, the force for fastening the members to be fastened 01 and 02 becomes large as a whole.

[0008]

By the way, the applicant of the present application has designed and planned a giant machine which generates a large static load due to its very heavy weight and generates a large impact load during operation. It has been found that an extremely powerful fastening device is required for fastening and assembling the casing of such a huge machine.

By the way, in the fastening device (super bolt) shown in FIG.
It has been found that the use as a fastening device for a huge machine has a problem in terms of reliability because it is supported by the support 5. In other words, an extremely large static load acts on a huge machine, but it is uneasy in terms of mechanical strength to support the extremely large static load with only the jack bolt 05.

[0010] Further, in a certain kind of huge machine, an extremely large impact load is applied during operation. If the fastening device shown in FIG.
There is a possibility that the tip of 5 may sink into the flat washer 06.

Further, in the fastening device (super bolt) shown in FIG. 11, the nut member 04 has a bolt hole 04b formed in a peripheral portion of a nut having a normal shape. As described above, except for the bolt hole 04b, the shape of the nut member 04 is the same as that of a normal nut. Therefore, when a load is applied, the shared load acting on each thread becomes uneven. Would. That is, the nut member 04
Of the threads on the member to be fastened 02 side (the bearing surface side of the nut) among the threads of the above, compared to the shared load acting on the thread on the side opposite to the member to be fastened 02 (the upper surface side of the nut). (This is a characteristic common to common nuts). For example, the shared load acting on the thread located on the nut seat surface side is about 10 times the shared load acting on the thread located on the nut upper surface side.

In a huge machine, an extremely large static load acts due to its own weight, and an extremely large impact load acts during operation. Where such a large load acts,
If the fastening device shown in FIG. 11 is used, an extremely large shared load acts on the thread located on the nut seat surface side.
For this reason, there is a possibility that the bolt may be broken at a portion of the jack bolt 05 which is screwed with the thread on the nut seat surface side where an extremely large shared load is acting.

SUMMARY OF THE INVENTION In view of the above prior art, an object of the present invention is to provide a fastening device capable of reliably fastening a member to be fastened even when an extremely large static load and an extremely large impact load are applied.

[0014]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the construction of the present invention penetrates a plurality of members to be fastened, and engages one end with the surface of the member located at one end. The other end side is a rod member protruding from the member to be fastened positioned on the other end side, and is screwed to the other end side of the rod member, and the peripheral portion is parallel to the nut hole at a plurality of positions along the circumferential direction. A nut member having a bolt hole formed therein, a plurality of bolt members screwed into the plurality of bolt holes toward the member to be fastened on the other end side, and a fastening member on the other end side with the nut member. A plurality of spacers are press-fitted into a gap between the members and are arranged in a circumferential direction.

Further, according to the structure of the present invention, one end side is engaged with the surface of the member to be fastened located at one end side and the other end side is located at the other end side while penetrating the plurality of stacked members to be fastened. A rod member protruding from the member to be fastened, and a nut member screwed to the other end side of the rod member and having a bolt hole formed at a plurality of positions along a circumferential direction parallel to the nut hole in a peripheral portion. After screwing a plurality of bolt members into the plurality of bolt holes toward the member to be fastened on the other end side, a gap between the nut member and the member to be fastened on the other end side is provided. A plurality of spacers are press-fitted and arranged in the circumferential direction, and thereafter, the remaining bolt members are removed except for the number of the bolt members functioning as detents of the nut members, and the bolt members are removed. I do.

Further, according to the structure of the present invention, while penetrating the plurality of members to be fastened, one end is engaged with the surface of the member to be fastened located at one end, and the other end is located at the other end. A rod member protruding from the member to be fastened, and a nut member screwed to the other end side of the rod member and having a bolt hole formed at a plurality of positions along a circumferential direction parallel to the nut hole in a peripheral portion. After screwing a plurality of bolt members into the plurality of bolt holes toward the member to be fastened on the other end side, a gap between the nut member and the member to be fastened on the other end side is provided. And a plurality of spacers are press-fitted and arranged in the circumferential direction, and thereafter, all the bolt members are removed.

Further, according to the structure of the present invention, while penetrating the plurality of members to be fastened, one end is engaged with the surface of the member to be fastened located at one end, and the other end is located at the other end. A rod member protruding from the member to be fastened, and a nut member screwed to the other end side of the rod member and having a bolt hole formed at a plurality of positions along a circumferential direction parallel to the nut hole in a peripheral portion. A plurality of bolt members that are respectively screwed into the plurality of bolt holes toward the member to be fastened on the other end side, and wherein the nut member has the bolt hole formed on the member to be fastened. The surface of the peripheral portion is formed so as to be offset from the surface of the central portion where the nut hole is formed in the direction opposite to the member to be fastened in the axial direction.

Further, according to the structure of the present invention, one end side is engaged with the surface of the member to be fastened positioned at one end side and the other end side is located at the other end side while penetrating a plurality of stacked members to be fastened. A rod member protruding from the member to be fastened, and a nut member screwed to the other end side of the rod member and having a bolt hole formed at a plurality of positions along a circumferential direction parallel to the nut hole in a peripheral portion. A plurality of bolt members that are respectively screwed into the plurality of bolt holes toward the member to be fastened on the other end side, and wherein the nut member has the bolt hole formed on the member to be fastened. The surface of the peripheral portion having a shape shifted from the surface of the central portion in which the nut hole is formed in the direction opposite to the member to be fastened in the axial direction, and the bolt member is ,
A screw portion is formed on the head side.

Further, according to the present invention, there is provided a fastening device for fastening a member to be fastened by using a bolt penetrating a plurality of stacked members to be fastened and a nut screwed to a tip portion of the bolt. An apparatus, which has a substantially cylindrical shape, is arranged on the outer peripheral side of the nut and concentrically with respect to the bolt and the nut, and has a support table having one end surface in contact with the member to be fastened, and Of which the screw is screwed to a position on the distal end side from the position where the support base is arranged,
A stress applying flange in which a plurality of jack bolt holes parallel to the bolt are formed at a plurality of positions along a circumferential direction in a peripheral portion; and each of the jack bolts extending in a direction from the stress applying flange side to the support table. It is characterized by being constituted by a plurality of jack bolts which are screwed into the holes and whose leading ends are in contact with the other end surface of the support base.

Further, according to the present invention, a jack bolt which is screwed to a tip portion of a bolt penetrating a plurality of members to be fastened and which is parallel to a nut hole at a plurality of positions along a circumferential direction at a peripheral portion is provided. A nut member having a hole formed therein, is screwed into each of the jack bolt holes along a direction from the nut member side toward the member to be fastened,
A plurality of jack bolts each having a tip abutting on the member to be fastened, and a spacer ring member arranged between the nut member and the member to be fastened and having a through hole through which the jack bolt passes. The spacer ring member is formed in a ring shape arranged on a concentric circumference centered on the bolt, the end surface of the nut member side in contact with the nut member is a flat surface, The end face has a first tapered ring that is inclined so that the thickness gradually increases from the peripheral edge toward the center in the radial direction, and a ring shape disposed concentrically around the bolt. The end surface on the member to be fastened in contact with the fastening member is flat, and the end surface on the nut member side is inclined so that the thickness gradually increases from the periphery to the center in the radial direction. And a second taper ring are, first
A surface extending from the inner peripheral edge to the center in the radial direction of the end surface on the member to be fastened in the tapered ring, and a surface extending from the inner peripheral edge to the center in the radial direction of the end surface on the nut member side in the second taper ring. And a plurality of arc-shaped pieces arranged concentrically around the bolt, the thickness gradually decreasing from the inner peripheral edge toward the outer side in the radial direction, A plurality of inner peripheral side taper flanges that are in contact with the end surfaces of the taper ring and the second taper ring in an inclined state, and a surface extending from the outer peripheral edge to the center in the radial direction of the end surface of the first taper ring on the member to be fastened. At the position between the end surface of the second taper ring on the nut member side and the surface extending from the outer peripheral edge to the center in the radial direction, and at a position on a concentric circle centered on the bolt. And a plurality of arc-shaped pieces arranged in one-to-one correspondence with the inner peripheral side taper ring. The thickness gradually decreases from the outer peripheral edge toward the inner side in the radial direction, and the first taper ring and A plurality of outer peripheral taper flanges that contact the end surface of the second taper ring in an inclined state, and radially penetrate the outer peripheral taper flange from the outer peripheral side toward the inner peripheral side with respect to each of the outer peripheral taper flanges; And a plurality of small bolts screwed to the corresponding inner peripheral side taper flange.

The present invention also provides a jack bolt which is screwed to a tip portion of a bolt penetrating a plurality of members to be fastened and which is parallel to a nut hole at a plurality of positions along a circumferential direction at a peripheral portion. A nut member having a hole formed therein, is screwed into each of the jack bolt holes along a direction from the nut member side toward the member to be fastened,
A plurality of jack bolts each having a tip abutting on the member to be fastened, and a spacer ring member arranged between the nut member and the member to be fastened and having a through hole through which the jack bolt passes. The spacer ring member has a ring shape arranged on a concentric circle centered on the bolt, and has a tapered surface whose thickness gradually decreases from the outer peripheral edge toward the inner peripheral edge in the radial direction. An outer peripheral side taper flange having, a plurality of arc-shaped pieces arranged concentrically around the bolt, the thickness gradually decreases from the inner peripheral edge toward the outer peripheral edge in the radial direction, A plurality of inner peripheral side taper flanges abutting on the taper surface of the taper flange, and radially penetrates from the outer peripheral side to the inner peripheral side with respect to the outer peripheral side taper flange. , Characterized in that it is composed of a plurality of small bolts screwed into each inner peripheral side tapered flange.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS <First Embodiment> FIG. 1 shows the overall configuration of a fastening device according to a first embodiment of the present invention applied to a huge machine. The nut will be described with reference to FIG. 2 showing the nut in a plan view, FIG. 3 showing the spacer in an enlarged plan view, and FIG. 4 showing the main configuration of the fastening device.

A rod member 4 penetrates through casing members 1, 2, 3 constituting the casing of the giant machine M. Female screws are formed at the upper end and the lower end of the rod member 4. A lower nut 5 is screwed to the lower end of the rod member 4, and an upper nut 6 is screwed to the upper end of the rod member 4. Have been. That is, the upper end of the rod member 4 is screwed with the upper nut 6 and is engaged with the upper surface of the casing member 1 via the upper nut 6, and the lower end of the rod member 4 penetrates the casing member 3 and It protrudes downward.

An upper washer 7 is interposed between the upper nut 6 and the upper surface of the casing member 1, and a lower washer 8 is disposed between the lower nut 5 and the lower surface of the casing member 3.
Is interposed.

In the peripheral portion of the lower nut 5, bolt holes 9 parallel to the nut holes 5a are formed at a plurality of positions (18 positions) along the circumferential direction. Push-up bolts 10 are screwed into the respective bolt holes 9. Each push-up bolt 10 is screwed upward from below, that is, toward the casing member 3.

As described above, after the upper nut 6 and the lower nut 5 are screwed into the rod member 4, each of the push-up bolts 10 is screwed into the bolt hole 9, so that the push-up bolt 10 is attached to the lower washer. A tightening force is applied to the casing member 3 through the pin 8.

It is to be noted that the push-up bolts 10 are such that after a pair of diagonal push-up bolts 10 are screwed in, a pair of diagonal push-up bolts 10 which are displaced by about 90 ° in the circumferential direction from their positions are screwed. Work is performed continuously and sequentially. When the work of screwing in all the push-up bolts 10 has completed one cycle, the same work is further performed a plurality of times (a plurality of rounds), thereby securely tightening.

After the tightening by the push-up bolts 10 is completed, a total of 18 T-shaped divided spacers 11 are inserted into the gap between the lower nut 5 and the lower washer 8.
With a hammer or the like. Therefore, the 18 spacers 11 are press-fitted and arranged side by side in the circumferential direction.

When the driving of all the spacers 11 is completed, the belt-shaped spacer retainer 12 is screwed to the peripheral surface of the lower nut 5, and the outer peripheral surface of the spacer 11 is retained by the spacer retainer 12.

In the fastening device having the above structure, an extremely large static load due to the initial tightening load of the giant machine M and an extremely large impact load generated during operation are divided by the push-up bolt 10 and the spacer 11 having a large pressure receiving area. And is transmitted to the lower nut 5. Since the spacer 11 having a large pressure receiving area supports most of the load, the load applied to the push-up bolt 10 is reduced, and the push-up bolt 10 does not sink into the lower washer 8 due to an impact load. Therefore, the fastening can be performed with high reliability.

As shown in FIG. 4, the push-up bolt 10 has a threaded portion 10a on the head side, a round bar portion 10b on the distal end side, and a threaded portion 10a on the head side.
Is screwed into the lower nut 5. For this reason, when an impact load is applied, the impact load is first transmitted to the round bar portion 10b at the tip, and the impact load can be buffered by the elasticity of the round bar portion 10b. Screw part 10a
Through the lower nut 5. As a result, the impact on the push-up bolt 10 is reduced as a whole, and the reliability is improved.

Further, the bearing surface of the push-up bolt 10 may be plated with copper to prevent seizure during tightening.

<Modification of First Embodiment> In the above-described fastening device, all the 18 push-up bolts 10 are left as they are after the spacer 11 is press-fitted, but the load is supported only by the spacer 11. So that several push-up bolts 1 function as detents for the lower nut 5.
You may leave 0 and remove the rest. In some cases, even if all the push-up bolts 10 are removed, the fastening force can be sufficiently maintained.

In the fastening device described above, the spacer 1
In order to make it easier to press-fit, the thickness of the spacer 11 is tapered so that it becomes thinner on the inner peripheral side.
If the tapered shape is such that the inner peripheral side is thicker and the outer peripheral side is thinner, the spacer 11 will not be pushed out to the outer peripheral side even when an impact load is applied. Therefore, in such a case, the spacer retainer 12 can be omitted.

<Second Embodiment> Next, a fastening device according to a second embodiment of the present invention applied to a huge machine will be described with reference to FIG. 2 shown in FIG. 2 and FIG. 3 showing an enlarged plan view of the spacer.
A description will be given with reference to FIG.

A rod member 4 penetrates through casing members 1, 2, 3 constituting the casing of the giant machine M. Female screws are formed at the upper end and the lower end of the rod member 4. A lower nut 5 is screwed to the lower end of the rod member 4, and an upper nut 6 is screwed to the upper end of the rod member 4. Have been. That is, the upper end of the rod member 4 is screwed with the upper nut 6 and is engaged with the upper surface of the casing member 1 via the upper nut 6, and the lower end of the rod member 4 penetrates the casing member 3 and It protrudes downward.

An upper washer 7 is interposed between the upper nut 6 and the upper surface of the casing member 1, and a lower washer 8 is disposed between the lower nut 5 and the lower surface of the casing member 3.
Is interposed.

In the peripheral portion of the lower nut 5, bolt holes 9 parallel to the nut hole 5a are formed at a plurality of positions (18 positions) along the circumferential direction.

Further, the shape of the lower nut 5 is such that, on the casing member 3 side (seat surface side), the surface 5b of the peripheral portion where the bolt hole 9 is formed is the surface 5c of the central portion where the nut hole 5a is formed. On the other hand, with respect to the axial direction, it has a special shape shifted in the direction opposite to the casing member 3 (the upper side of the nut; the lower side in FIGS. 1 and 4).

Push-up bolts 10 are screwed into the respective bolt holes 9. Each lifting bolt 1
0 is screwed upward from below, that is, toward the casing member 3. This lifting bolt 1
4, a screw portion 10a is formed on the head side as shown in FIG. 4, a round bar portion 10b is formed on the distal end side, and screwed to the lower nut 5 with the screw portion 10a on the head side. are doing.

As described above, after the upper nut 6 and the lower nut 5 are screwed into the rod member 4, each of the push-up bolts 10 is screwed into the bolt hole 9, so that the push-up bolt 10 is attached to the lower washer. A tightening force is applied to the casing member 3 through the pin 8.

It should be noted that the push-up bolts 10 are such that after a pair of push-up bolts 10 on a diagonal line are screwed in, a pair of push-up bolts 10 on a diagonal line, which is displaced from the position by about 90 ° in the circumferential direction, is screwed. Work is performed continuously and sequentially. When the work of screwing in all the push-up bolts 10 has completed one cycle, the same work is further performed a plurality of times (a plurality of rounds), thereby securely tightening.

When the tightening by the push-up bolts 10 is completed, a total of 18 T-shaped divided spacers 11 are inserted in the gap between the lower nut 5 and the lower washer 8.
With a hammer or the like. Therefore, the 18 spacers 11 are press-fitted and arranged side by side in the circumferential direction.

When the driving of all the spacers 11 is completed, the belt-shaped spacer retainer 12 is screwed to the peripheral surface of the lower nut 5, and the outer peripheral surface of the spacer 11 is retained by the spacer retainer 12.

In the fastening device having the above structure, an extremely large static load caused by the initial tightening load of the giant machine M and an extremely large impact load generated during operation are divided by the push-up bolt 10 and the spacer 11 having a large pressure receiving area. And is transmitted to the lower nut 5. Since the spacer 11 having a large pressure receiving area supports most of the load, the load applied to the push-up bolt 10 is reduced, and the push-up bolt 10 does not sink into the lower washer 8 due to an impact load. Therefore, the fastening can be performed with high reliability.

Further, since the shape of the lower nut 5 is a special shape, the shared load acting on each thread of the lower nut 5 becomes uniform. This will be described with reference to FIG.

FIG. 5 (a) shows the lower nut 5 of the present invention, and FIG. 5 (b) shows the nut N1 of Comparative Example 1 in which the lower nut 5 is turned upside down and the bolt hole is eliminated. Show,
FIG. 5C shows a normal nut N2 as Comparative Example 2,
FIG. 5D shows the thread load distribution of the present application and the comparative example.

As can be seen from FIG. 5, in the lower nut 5 of the present application having a special shape, the shared load acting on each thread is made uniform. For this reason, even if an extremely large load acts, such a large load can be shared and supported substantially uniformly by each screw thread. For this reason, since the load is shared and acts substantially evenly on the thread portion of the push-up bolt 10 screwed into the bolt hole 9 of the lower nut 5, there is no possibility that the push-up bolt 10 is broken and the reliability is improved. Can be concluded.

As shown in FIG. 4, the push-up bolt 10 has a threaded portion 10a on the head side, a round bar portion 10b on the tip side, and a threaded portion 10a on the head side.
Is screwed into the lower nut 5. Therefore, when a load is applied, the load is transmitted from the push-up bolt 10 to the lower portion of the lower nut 5, and the load is further uniformly transmitted to each thread of the lower nut 5. For this reason,
The load acting on the lifting bolt 10 can be made uniform, and the reliability is further improved.

<Third Embodiment> Next, a fastening device according to a third embodiment of the present invention will be described with reference to FIG.

As shown in FIG. 6, a large-diameter and large-sized nut 104 is screwed to a tip end of a large-diameter and large-sized bolt 103 penetrating the superposed members 101 and 102. By screwing the nut 104, the bolt 10
3 and the nut 104 cooperate with each other,
Can be tightened, and the nut 103 can be loosened by unscrewing the nut 103.

The fastening device 150 according to the third embodiment
When the nut 104 is screwed forward for fastening or when the nut 104 is screwed back to loosen the fastening, the bolt 1
03 in the direction of arrow A
By expanding the body of the nut 104, a gap is created between the nut 104 and the member to be fastened 101, and the nut 104 can be easily advanced and retracted.

The fastening device 150 includes a support table 151,
The stress applying flange 152 and the jack bolt 153 are configured as main members.

The support table 151 has a substantially cylindrical shape, and is disposed on the outer peripheral side of the nut 104 and concentrically with the bolt 103 and the nut 104 when the nut 104 is screwed and retreated. . And one end surface 151 of the support 151
a contacts the surface of the member to be fastened 101.

The stress applying flange 152 is a nut-shaped member. When the nut 104 is screwed or unscrewed, it is screwed into the bolt 103 at a position more distal than the position where the support table 151 is arranged. A plurality of jack bolt holes 152a parallel to the bolts 103 are formed in the peripheral portion of the stress applying flange 152 at a plurality of positions along the circumferential direction.

The plurality of jack bolts 153 are attached to the support table 151 (the member 10 to be fastened) from the stress applying flange 152 side.
1, 102), and screwed into each jack bolt hole 152a. As the jack bolt 153 is screwed in, the tip of the jack bolt 153 becomes
51b.

In the fastening device 150 having the above structure, the support 151 and the stress applying flange 152 are
After setting to the state shown in
Is screwed toward the members 101 and 102 to be fastened, the jack bolt 153
Press 1b. The reaction force generated by the jack bolt 153 pressing the other end surface 151b is applied to the stress applying flange 152.
The bolt 103 acts on the bolt 103 via the contact hole, and the body of the bolt 103 is extended in the direction of arrow A by this reaction force.

When the bolt 103 expands, the nut 104
A gap is formed between the nut 104 and the member
Can be easily screwed toward the member to be fastened 101 and fastened. For this reason, the fastening operation is facilitated, and secure fastening is enabled.

After the tightening of the nut 104 is completed, each jack bolt 153 is loosened, the stress applying flange 152 is screwed out and removed from the bolt 103, and the support 151 is also removed. The removed fastening device 150 is used for fastening other parts of the bolt and nut.

On the other hand, when loosening the nut 104 which has been tightened, the support stand 151 and the stress applying flange 152 are set in the same manner as in the tightening, and the jack bolt 15 is set.
By screwing 3 and extending the bolt 103,
A gap is created between the nut 104 and the member to be fastened 101. By doing so, the screw 104 can be easily retreated.

If this fastening device 150 is used, the bolt 1
As the 03 and the nut 104, ordinary ones can be used, and secure fastening can be performed while easy to tighten and remove. In addition, when attempting to extend the large bolt 103, it is generally conceivable to use hydraulic pressure or to use heating expansion / cooling contraction. -Although a complicated device such as a cooling device is required, if the present invention is used, such a complicated device is unnecessary, and the bolt 103 can be easily extended.

<Fourth Embodiment> Next, a fastening device according to a fourth embodiment of the present invention will be described with reference to FIG.
A description will be given with reference to FIG. 8 which is a sectional view taken along line XX of FIG. 7 and FIG.

As shown in these figures, large-diameter and large bolts 203 are
Is penetrating. A large-diameter / large-sized nut member 204 having a nut hole 204a is screwed to the tip of the bolt 203. In the peripheral portion of the nut member 204, jack bolt holes 204b are formed at a plurality of positions along the circumferential direction and are parallel to the nut holes 204a.

The plurality of jack bolts 205 extend in the direction from the nut member 204 to the member 201 to be fastened.
It is screwed into each jack bolt hole 204b. As the jack bolt 205 is screwed in, its tip comes into contact with the surface of the member 201 to be fastened.

The spacer ring member 260 is disposed between the nut member 204 and the member 201 to be fastened.
Each jack bolt 205 has a through hole 261 through which it passes. That is, the jack bolt 205 is
1, and the tip thereof comes into contact with the surface of the member 201 to be fastened.

The spacer ring member 260 includes a first (upper) taper ring 262, a second (lower) taper ring 263, an inner peripheral taper flange 264, an outer peripheral taper flange 265, and a small The bolt 266 is configured as a main member.

The first (upper) tapered ring 262 has a ring shape and is disposed on a concentric circumference centered on the bolt 203. The end surface 262a on the nut member side (upper side) in contact with the nut member 204 is a flat surface. Further, the end surface 262b on the side of the member to be fastened 201 (lower side).
Is radially from the periphery to the center (ie, from the outer periphery to the center in the radial direction,
And it is inclined so that the wall thickness gradually increases (from the inner peripheral edge toward the center in the radial direction). That is, the lower end surface 262b is formed so as to protrude downward.

The second (lower) tapered ring 263 has a ring shape and is disposed on a concentric circle centered on the bolt 203. The end surface 263a on the side of the member to be fastened (lower side) that is in contact with the member 201 to be fastened is flat. Also, the end surface 263b on the nut member 204 side (upper side)
Is radially from the periphery to the center (ie, from the outer periphery to the center in the radial direction,
And it is inclined so that the wall thickness gradually increases (from the inner peripheral edge toward the center in the radial direction). That is, the upper end surface 263b is formed so as to protrude upward.

A plurality of (six in this example) inner peripheral side taper flanges 264 are arc-shaped pieces. The plurality of inner peripheral side taper flanges 264 are connected to the first taper ring 262.
Between a surface of the lower end surface 262b extending from the inner peripheral edge to the center in the radial direction and a surface of the upper end surface 263b of the second taper ring 263 extending from the inner peripheral edge to the center in the radial direction. And are arranged at concentric positions around the bolt 203. The thickness of each inner peripheral side tapered flange 264 gradually decreases from the inner peripheral edge toward the outer side in the radial direction. Each inner peripheral side tapered flange 264 contacts the end surface 262b in an inclined state on its upper surface, and contacts the end surface 263b in an inclined state on its lower surface.

A plurality (six in this example) of outer peripheral side tapered flanges 265 are arc-shaped pieces. The plurality of outer peripheral side taper flanges 265 are connected to the first taper ring 262.
Of the lower end surface 262b of the lower end surface 262b from the outer peripheral edge to the center in the radial direction and the upper end surface 263b of the second taper ring 263 from the outer peripheral edge to the center of the second taper ring 263 in the radial direction. And are arranged at concentric positions around the bolt 203. Moreover, the outer peripheral side taper flange 265 is arranged in one-to-one correspondence with the inner peripheral side taper flange 264. Each outer peripheral side taper flange 265 gradually decreases in thickness from the outer peripheral edge toward the inside in the radial direction. Each outer peripheral side tapered flange 265 contacts the end face 262b on its upper surface in an inclined state, and contacts the end face 263b on its lower surface in an inclined state.

Each of the outer peripheral side tapered flanges 265 has a through hole 265a penetrating in the radial direction. Further, a screw hole 264a extending in the radial direction is formed in each inner peripheral side tapered flange 264. Moreover, the tapered flanges 265, 264 on the outer peripheral side and the inner peripheral side corresponding to one to one.
In, the through hole 265a and the screw hole 264a are arranged in a straight line in the radial direction.

A plurality (six in this example) of small bolts 266
Penetrates the through hole 265a of each outer peripheral taper flange 265 in the radial direction from the outer peripheral side toward the inner peripheral side, and
The distal end of the corresponding 66 has a corresponding inner peripheral side tapered flange 264.
Screw hole 264a.

In the fastening device according to the fourth embodiment having the above structure, when each jack bolt 205 is screwed toward the member 201 to be fastened, the jack bolt 205 moves the member 201 downward. Press The reaction force generated by the jack bolt 205 pressing the member to be fastened 201 acts on the bolt 203 via the nut member 204, and the body of the bolt 203 is extended in the direction of arrow B (see FIG. 7).

When the bolt 203 is extended in this manner, the distance between the member 201 to be fastened and the nut member 204 becomes slightly longer, and a gap is created between the nut member 204 and the spacer ring member 260.

Nut member 204 and spacer ring member 2
When a gap is formed between the small bolts and the small bolts, the small bolts 266 are screwed from the outer peripheral side toward the central axis. Then, the corresponding six sets of inner peripheral side taper flanges 264 and outer peripheral side taper flanges 265 approach each other. When the inner peripheral side and the outer peripheral side taper flanges 264, 265 approach each other, the taper flanges 264, 265 have an effect of expanding the upper and lower taper rings 262, 263.
Therefore, the length between the upper and lower taperings 262 and 263 becomes longer, and the entire axial length (length in the vertical direction) of the spacer ring member 260 becomes longer.
The gap generated between the nut 60 and the nut member 204 can be filled. In this state, it is possible to hold the bolt 203 in an extended state only with the spacer ring member 260.

As described above, since the tightening can be performed with the bolt 203 extended, the members to be fastened 201 and
02 can be securely fastened.

The bolt 2 is formed only by the spacer ring member 260.
After 03 can be held in an extended state, the jack bolt 205 can be loosened and removed. The removed jack bolt 205 can be used for fastening other parts of the bolt, the spacer ring member, and the nut member. That is, unlike the conventional super bolt, it is not necessary to attach the jack bolt to the nut member as it is. There is no need for a huge wrench for bolting.
In addition, when attempting to extend the large bolt 203, it is generally conceivable to use hydraulic pressure, or to use heating expansion / cooling contraction. -Although a complicated device such as a cooling device is required, if the present invention is used, such a complicated device is unnecessary, and the bolt 203 can be easily extended.

In order to loosen this fastening device, it is not necessary to screw and advance the jack bolt 205 again, and it is only necessary to screw each small bolt 266 to the outer peripheral side and loosen it. That is, when each small bolt 266 is screwed back to the outer peripheral side, the corresponding inner peripheral side taper flange 264 and outer peripheral side taper flange 2
65 are separated from each other, the pressing force of the taper rings 262, 263 decreases, and the upper and lower taper rings 262, 263 approach, and the length of the spacer ring member 260 as a whole in the vertical direction is shortened. Thus, the spacer ring member 26
0 and a nut member 204 are formed, and the bolt 20
3 contracts and loses its fastening force.

Although not shown, a small hydraulic cylinder may be used instead of the small bolt 266 to simultaneously separate and contact the inner peripheral taper flange 264 and the outer peripheral taper flange 265.

<Fifth Embodiment> Next, a fastening device according to a fifth embodiment of the present invention will be described with reference to FIG. The fastening device according to the fifth embodiment is different from the fastening device according to the fourth embodiment in that the spacer ring member 260
Instead of using the spacer ring member 360. Therefore, the description of the same parts as in the fourth embodiment is omitted, and the spacer ring member 360 is omitted.
I will explain mainly.

The spacer ring member 360 used in the fastening device according to the fifth embodiment includes the jack bolt 205
Has a through hole 361 that penetrates. The spacer ring member 360 includes an outer taper flange 362, an inner taper flange 363, and a small bolt 364 as main members.

The outer peripheral taper flange 362 has a ring shape and is arranged on a concentric circle centered on the bolt 203. The outer peripheral side tapered flange 362 has a tapered surface 362a whose thickness gradually decreases from the outer peripheral edge toward the inner peripheral edge in the radial direction.

The plurality of inner peripheral side tapered flanges 363 are arc-shaped pieces. The plurality of inner peripheral side taper flanges 363 are arranged on a concentric circle centered on the bolt 203. Each inner peripheral side taper flange 363 has a taper surface 362 of the outer peripheral side taper flange 362 while gradually decreasing in thickness from the inner peripheral edge to the outer peripheral edge in the radial direction.
a.

A plurality of through holes 362b penetrating in the radial direction are formed in the annular convex portion on the outer peripheral edge of the outer peripheral side tapered flange 362 in a circumferential direction. Further, a screw hole 363a extending in the radial direction is formed in each inner peripheral side tapered flange 363. Moreover, the through holes 362b and the screw holes 363a are arranged in a straight line in the radial direction.

A plurality of small bolts 364 radially penetrate through holes 362 b of the outer peripheral side tapered flange 362 from the outer peripheral side to the inner peripheral side, and the tip end of the small bolt 364 has a corresponding inner peripheral side tapered flange 363. Screw hole 363a.

When fastening is performed in the fastening device according to the fifth embodiment having the above-described configuration, each jack bolt 205 is screwed into the gap between the nut member 204 and the spacer ring member 360. Cause.

When the small bolt 364 is screwed in this state, each inner peripheral side tapered flange 363 is formed into a tapered surface 362a.
Move radially outward on top. That is, the inner peripheral side tapered flange 363 climbs the tapered surface 362a. As a result, the entire axial length (vertical length) of the spacer ring member 360 is increased, and the gap created between the spacer ring member 360 and the nut member 204 can be filled. In this state, the jack bolt 205 is loosened and removed, and the spacer ring member 360 is removed.
Only with this, the bolt 203 is held in an extended state.

In order to loosen this fastening device, it is not necessary to screw and advance the jack bolt 205 again, but only to screw the small bolts 364 to the outer peripheral side and loosen them. That is, when each small bolt 266 is screwed back to the outer peripheral side, each inner peripheral side tapered flange 363 moves to the inner peripheral side and the tapered surface 36 is moved.
As a result, the spacer ring member 360 has a shorter overall length in the vertical direction. Thus, a gap is formed between the spacer ring member 360 and the nut member 204, and the bolt 203 contracts and loses the fastening force.

[0089]

As described above in detail with the embodiments, according to the present invention, a plurality of the members to be fastened are overlapped with each other, and one end is connected to the surface of the member to be fastened located at one end. The other end side is a rod member protruding from the member to be fastened located on the other end side, and is screwed to the other end side of the rod member, and the peripheral portion is provided with nut holes at a plurality of locations along the circumferential direction. A nut member having a parallel bolt hole formed therein, and a plurality of bolt members screwed into the plurality of bolt holes toward the member to be fastened on the other end side,
The spacer is press-fitted into a gap between the nut member and the member to be fastened on the other end side and includes a plurality of spacers arranged in a circumferential direction.

With this configuration, most of the load can be supported by the spacer having a large pressure receiving area. Therefore, the load applied to the bolt member is reduced, and the tip of the bolt member does not sink even when an impact load is applied. . For this reason, fastening can be performed with high reliability, and it can be used as a fastening device when assembling a heavy and long structure.

Further, according to the present invention, one end side engages the surface of the member to be fastened positioned at one end side and the other end side engages with the surface of the member to be fastened positioned at the other end side while penetrating the plurality of stacked members to be fastened. A rod member protruding from the member, and a nut member screwed to the other end side of the rod member and having bolt holes formed at a plurality of positions along a circumferential direction in the peripheral edge thereof in parallel with the nut holes. At the same time, after screwing a plurality of bolt members into the plurality of bolt holes toward the member to be fastened on the other end side, a plurality of bolt members are provided in a gap between the nut member and the member to be fastened on the other end side. The spacers were press-fitted and arranged in the circumferential direction, and thereafter, the remaining bolt members were removed except for the number of the bolt members functioning as detents for the nut members.

With this configuration, the number of bolt members to be used after the completion of the fastening can be reduced, which contributes to a reduction in the number of parts.

Further, according to the present invention, a plurality of members to be fastened are stacked, one end of which is engaged with the surface of the member to be fastened positioned at one end, and the other end is engaged with the surface of the member to be fastened positioned at the other end. A rod member protruding from the member, and a nut member screwed to the other end side of the rod member and having bolt holes formed at a plurality of positions along a circumferential direction in the peripheral edge thereof in parallel with the nut holes. At the same time, after screwing a plurality of bolt members into the plurality of bolt holes toward the member to be fastened on the other end side, a plurality of bolt members are provided in a gap between the nut member and the member to be fastened on the other end side. Are press-fitted and arranged in the circumferential direction, and thereafter, the bolt members are all removed.

With this configuration, a bolt member to be used after completion of the fastening can be eliminated, and the number of parts can be further reduced.

Further, according to the present invention, one end is engaged with the surface of the member to be fastened positioned at one end and the other end is engaged with the surface of the member to be fastened positioned at the other end while penetrating the plurality of stacked members to be fastened. A rod member protruding from the member, a nut member screwed to the other end side of the rod member, and a nut member having a plurality of bolt holes parallel to the nut hole formed at a plurality of positions along a circumferential direction in a peripheral portion; A plurality of bolt members that are respectively screwed into the plurality of bolt holes toward the member to be fastened on the other end side, and wherein the nut member has the bolt hole formed on the member to be fastened The configuration is such that the surface of the peripheral portion is shifted from the surface of the central portion where the nut hole is formed in the direction opposite to the member to be fastened in the axial direction.

As described above, since the nut member has a special shape, the shared load acts substantially uniformly on each thread of the nut member. Therefore, a substantially uniform load acts equally on the threaded portion of the bolt member. The risk of bolt breakage of the bolt member is eliminated. For this reason, fastening can be performed with high reliability,
It can be used as a fastening device when assembling a long structure.

Further, according to the present invention, a plurality of members to be fastened are stacked and one end is engaged with the surface of the member to be fastened located at one end, and the other end is engaged with the surface of the member to be fastened positioned at the other end. A rod member protruding from the member, a nut member screwed to the other end side of the rod member, and a nut member having a plurality of bolt holes parallel to the nut hole formed at a plurality of positions along a circumferential direction in a peripheral portion; A plurality of bolt members that are respectively screwed into the plurality of bolt holes toward the member to be fastened on the other end side, and wherein the nut member has the bolt hole formed on the member to be fastened The surface of the peripheral portion has a shape shifted from the surface of the central portion where the nut hole is formed in the direction opposite to the member to be fastened in the axial direction, and the bolt member has a head portion. Thread is formed on the part side It has a configuration that is.

As described above, the nut member is formed into a special shape, and the screw portion is formed only on the head side of the bolt member. Therefore, the shared load acting on each thread of the nut member is further uniformed, A more uniform load also acts on the threaded portion of the member, and there is no danger of the bolt member breaking the bolt. For this reason, the fastening can be performed with high reliability,
It can be used as a fastening device when assembling heavy structures and long structures.

Further, according to the present invention, there is provided a fastening device used when fastening the member to be fastened by using a bolt penetrating a plurality of stacked members to be fastened and a nut screwed into a tip portion of the bolt. A support table having a substantially cylindrical shape, disposed concentrically on the outer periphery of the nut and the bolt and the nut, and having one end surface abutting on the member to be fastened; A stress applying flange which is screwed to a position on the distal end side from a position where the support base is arranged, and has a jack bolt hole formed parallel to the bolt at a plurality of positions along a circumferential direction at a peripheral portion. A plurality of jack bolts, which are screwed into the respective jack bolt holes along the direction from the stress applying flange side to the support table and whose leading ends abut on the other end surface of the support table. It was.

With such a configuration, ordinary bolts and nuts can be used, and secure fastening can be performed while easy tightening and removal are possible. In addition, when attempting to extend a large bolt, it is generally conceivable to use hydraulic pressure, or to use heating expansion / cooling contraction. Although a complicated device such as a cooling device is required, if the present invention is used, such a complicated device is not necessary, and the bolt can be easily extended.

Further, according to the present invention, a jack bolt hole which is screwed into a tip portion of a bolt which has penetrated a plurality of members to be fastened and which is parallel to a nut hole is formed in a peripheral portion at a plurality of positions along a circumferential direction. A formed nut member;
A plurality of jack bolts, which are screwed into the respective jack bolt holes along the direction from the nut member side toward the member to be fastened, and whose tips contact the member to be fastened,
A spacer ring member is disposed between the nut member and the member to be fastened, and has a through-hole through which the jack bolt penetrates. It has a ring shape arranged on a concentric circumference, and the end surface on the nut member side in contact with the nut member is a flat surface, and the end surface on the member to be fastened has a thickness in the radial direction from the peripheral edge toward the center. A first tapered ring that is inclined so as to gradually increase and a ring shape arranged on a concentric circle centered on the bolt, and an end surface of the member to be fastened that is in contact with the member to be fastened is flat. The end face on the nut member side has a second tapered ring and a first tapered ring that are inclined so that the thickness gradually increases from the peripheral edge toward the center in the radial direction. A position between a surface of the end surface on the member to be fastened from the inner peripheral edge to the center in the radial direction and a surface of the end surface on the nut member side of the second taper ring from the inner peripheral edge to the center in the radial direction. And a plurality of arc-shaped pieces arranged concentrically around the bolt, the thickness gradually decreasing from the inner peripheral edge to the outer side in the radial direction, and the first tapered ring and the A plurality of inner peripheral side taper flanges in contact with the end surface of the second taper ring in an inclined state; a surface extending from the outer peripheral edge to the center in the radial direction of the end surface of the first taper ring on the member to be fastened; Of the end surfaces on the nut member side in the taper ring, they are arranged at a position between a surface extending from the outer peripheral edge to the center in the radial direction and at a concentric circumferential position centered on the bolt, and A plurality of arc-shaped pieces arranged in one-to-one correspondence with the side taper ring. The thickness of the first taper ring and the second taper ring is gradually reduced from the outer peripheral edge toward the inner side in the radial direction. A plurality of outer peripheral taper flanges that are in contact with the end surface in an inclined state, and an inner periphery that penetrates each of the outer peripheral taper flanges in a radial direction from the outer peripheral side toward the inner peripheral side to correspond to the outer peripheral taper flange. And a plurality of small bolts screwed to the side taper flange.

With this configuration, the bolt can be tightened in the expanded state, and the member to be fastened can be securely fastened. The removed jack bolt can be used for fastening other parts of the bolt, the spacer ring member, and the nut member. That is, unlike the conventional super bolt, it is not necessary to attach the jack bolt to the nut member as it is. There is no need for a huge wrench for bolting. In addition, when attempting to extend a large bolt, it is generally conceivable to use hydraulic pressure, or to use heating expansion / cooling contraction. Although a complicated device such as a cooling device is required, if the present invention is used, such a complicated device is not necessary, and the bolt can be easily extended.

The present invention also provides a jack bolt which is screwed to a tip end portion of a bolt penetrating a plurality of members to be fastened and which is parallel to a nut hole at a plurality of positions along a circumferential direction at a peripheral edge portion. A nut member having a hole formed therein, is screwed into each of the jack bolt holes along a direction from the nut member side toward the member to be fastened,
A plurality of jack bolts each having a tip abutting on the member to be fastened, and a spacer ring member arranged between the nut member and the member to be fastened and having a through hole through which the jack bolt passes. The spacer ring member has a ring shape arranged on a concentric circle centered on the bolt, and has a tapered surface whose thickness gradually decreases from the outer peripheral edge toward the inner peripheral edge in the radial direction. An outer peripheral side taper flange having, a plurality of arc-shaped pieces arranged concentrically around the bolt, the thickness gradually decreases from the inner peripheral edge toward the outer peripheral edge in the radial direction, A plurality of inner peripheral side taper flanges abutting on the taper surface of the taper flange, and radially penetrates from the outer peripheral side to the inner peripheral side with respect to the outer peripheral side taper flange. , Characterized in that it is composed of a plurality of small bolts screwed into each inner peripheral side tapered flange.

With this configuration, it is possible to tighten the bolt in a stretched state, and to securely fasten the member to be fastened. The removed jack bolt can be used for fastening other parts of the bolt, the spacer ring member, and the nut member. That is, unlike the conventional super bolt, it is not necessary to attach the jack bolt to the nut member as it is. There is no need for a huge wrench for bolting. In addition, when attempting to extend a large bolt, it is generally conceivable to use hydraulic pressure, or to use heating expansion / cooling contraction. Although a complicated device such as a cooling device is required, if the present invention is used, such a complicated device is not necessary, and the bolt can be easily extended.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing a fastening device according to first and second embodiments of the present invention.

FIG. 2 is a plan view showing a lower nut.

FIG. 3 is an enlarged plan view showing a spacer.

FIG. 4 is a configuration diagram showing a main part of the fastening device according to the first and second embodiments.

FIG. 5 is an explanatory diagram showing a state of a shared load by comparing a fastening device according to a second embodiment of the present invention with a comparative example.

FIG. 6 is a configuration diagram showing a fastening device according to a third embodiment of the present invention.

FIG. 7 is a configuration diagram showing a fastening device according to a fourth embodiment of the present invention.

FIG. 8 is a sectional view taken along line XX of FIG. 7;

FIG. 9 is an exploded cross-sectional view illustrating a main part of a fastening device according to a fourth embodiment.

FIG. 10 is a configuration diagram showing a fastening device according to a fifth embodiment of the present invention.

FIG. 11 is a configuration diagram showing a conventional fastening device.

[Explanation of symbols]

 1, 2, 3 Casing member 4 Rod member 5 Lower nut 5a Nut hole 5b Surface of peripheral portion 5c Surface of central portion 6 Upper nut 7 Upper washer 8 Lower washer 9 Bolt hole 10 Push-up bolt 10a Screw portion 10b Round bar portion 11 Spacer 12 Spacer Holder 101, 102 Workpiece to be fastened 103 Bolt 104 Nut 150 Fastening device 151 Support base 152 Stress applying flange 153 Jack bolt 201, 202 Workpiece to be fastened 203 Bolt 204 Nut member 205 Jack bolt 260 Spacer ring member 261 Through hole 262 First 263 Second taper ring 264 Inner circumference taper flange 265 Outer circumference taper flange 266 Small bolt 360 Spacer ring member 361 Through hole 362 Outer circumference taper flange 363 Inner circumference tape Pafranj M Giant Machine

Claims (8)

[Claims] An end penetrates a plurality of members to be fastened, one end of which engages a surface of a member to be fastened located at one end, and the other end projects from a member to be fastened located at the other end. A nut member screwed to the other end side of the rod member, and a nut member formed with bolt holes parallel to the nut hole at a plurality of positions along a circumferential direction in a peripheral portion; A plurality of bolt members screwed into the plurality of bolt holes, respectively, toward the member to be fastened, and are press-fitted into a gap between the nut member and the member to be fastened on the other end side, and are arranged in the circumferential direction. A fastening device comprising a plurality of spacers. 2. A through-hole penetrates a plurality of members to be fastened, one end of which engages the surface of the member to be fastened located at one end, and the other end projects from the member to be fastened located at the other end. And a nut member screwed to the other end side of the rod member, and a nut member having bolt holes parallel to the nut holes formed at a plurality of positions along a circumferential direction in a peripheral portion thereof. After screwing the plurality of bolt members into the plurality of bolt holes, respectively, toward the member to be fastened on the other end side,
A plurality of spacers are press-fitted in the gap between the nut member and the member to be fastened on the other end side and arranged in the circumferential direction, and thereafter, the number of the bolt members that functions as a detent for the nut member is left. A fastening device, wherein the remaining bolt members are removed. 3. A plurality of members to be fastened are stacked, one end of which is engaged with the surface of the member to be fastened located at one end, and the other end of which projects from the member to be fastened located at the other end. And a nut member screwed to the other end side of the rod member, and a nut member having bolt holes parallel to the nut holes formed at a plurality of positions along a circumferential direction in a peripheral portion thereof. After screwing the plurality of bolt members into the plurality of bolt holes, respectively, toward the member to be fastened on the other end side,
A fastening device, wherein a plurality of spacers are press-fitted in a gap between the nut member and a member to be fastened on the other end side and arranged in a circumferential direction, and thereafter, the bolt member is entirely removed. . 4. A plurality of members to be fastened are stacked, one end of which is engaged with a surface of a member to be fastened positioned at one end and the other end protrudes from a member to be fastened located at the other end. A nut member screwed to the other end side of the rod member, and a nut member formed with bolt holes parallel to the nut hole at a plurality of positions along a circumferential direction in a peripheral portion; A plurality of bolt members which are screwed into the plurality of bolt holes, respectively, toward the member to be fastened, and the nut member has a peripheral portion where the bolt hole is formed on the member to be fastened. A fastening device, characterized in that a surface is displaced in a direction opposite to a member to be fastened in an axial direction with respect to a surface of a central portion where the nut hole is formed. 5. A plurality of members to be fastened are stacked, one end of which is engaged with a surface of a member to be fastened positioned at one end, and the other end protrudes from a member to be fastened located at the other end. A nut member screwed to the other end side of the rod member, and a nut member formed with bolt holes parallel to the nut hole at a plurality of positions along a circumferential direction in a peripheral portion; A plurality of bolt members which are screwed into the plurality of bolt holes, respectively, toward the member to be fastened, and the nut member has a peripheral portion where the bolt hole is formed on the member to be fastened. The surface has a shape shifted in the direction opposite to the member to be fastened with respect to the axial direction with respect to the surface of the central portion where the nut hole is formed, and the bolt member is located on the head side. Make sure that the thread is Fastening device according to claim. 6. A fastening device for fastening a member to be fastened by using a bolt that has penetrated a plurality of stacked members to be fastened, and a nut that is screwed to a tip portion of the bolt. A substantially cylindrical shape, a support table which is arranged on the outer peripheral side of the nut and concentrically with respect to the bolt and the nut, and one end surface of which is in contact with the member to be fastened, wherein the support table of the bolts is A stress applying flange which is screwed to a position on the distal end side from the position to be arranged, and has a jack bolt hole formed at a plurality of positions along a circumferential direction parallel to the bolt in a peripheral portion; Along the direction from the application flange side toward the support table, the jack bolts are screwed into the respective jack bolt holes, and the tip is constituted by a plurality of jack bolts abutting on the other end surface of the support table. Characteristic fastening device. 7. A jack bolt hole which is screwed to a tip portion of a bolt which has penetrated a plurality of members to be fastened and which is parallel to a nut hole is formed in a peripheral portion at a plurality of positions along a circumferential direction. A plurality of jack bolts, which are screwed into the respective jack bolt holes along a direction from the nut member side toward the member to be fastened and whose tips abut on the member to be fastened, A spacer ring member arranged between the member to be fastened and having a through hole through which the jack bolt penetrates, wherein the spacer ring member has a concentric circumference centered on the bolt. The end surface on the nut member side in contact with the nut member has a flat surface, and the end surface on the member to be fastened has a peripheral edge in the radial direction. A first tapered ring that is inclined so that the wall thickness gradually increases toward the center, and a member to be fastened in a ring shape arranged on a concentric circumference centered on the bolt, the member being in contact with the member to be fastened The end surface on the side of the nut is flat, and the end surface on the side of the nut member is inclined in such a manner that the thickness gradually increases from the peripheral edge toward the center in the radial direction. A position between a surface extending from the inner peripheral edge to the center in the radial direction of the end surface on the fastening member side and a surface extending from the inner peripheral edge to the center in the radial direction of the end surface on the nut member side in the second taper ring. And a plurality of arcuate pieces arranged concentrically around the bolt, the first tapering and the first tapering ring being gradually reduced in thickness from the inner peripheral edge toward the outer side in the radial direction. A plurality of inner peripheral side taper flanges which are in contact with an end surface of the second taper ring in an inclined state; a surface extending from an outer peripheral edge to a center in a radial direction of an end surface of the first taper ring on a member-to-be-fastened; Of the end surfaces on the nut member side in the tapered ring, a position between a surface extending from the outer peripheral edge to the center in the radial direction, and a concentric circle centered on the bolt, and the inner peripheral side A plurality of arc-shaped pieces arranged one-to-one with the tapered ring, the end faces of the first tapered ring and the second tapered ring gradually decreasing in thickness from the outer peripheral edge toward the inside in the radial direction. A plurality of outer peripheral taper flanges in contact with the outer peripheral taper flange in an inclined state, and penetrate in a radial direction from the outer peripheral side to the inner peripheral side with respect to each of the outer peripheral taper flanges to correspond to the outer peripheral taper flange. And a plurality of small bolts screwed to the inner peripheral side tapered flange. 8. A bolt bolt which penetrates a plurality of members to be fastened is screwed into a tip portion of the bolt, and a plurality of jack bolt holes are formed in a peripheral portion of the bolt along a circumferential direction. A plurality of jack bolts, which are screwed into the respective jack bolt holes along a direction from the nut member side toward the member to be fastened and whose tips abut on the member to be fastened, A spacer ring member arranged between the member to be fastened and having a through hole through which the jack bolt penetrates, wherein the spacer ring member has a concentric circumference centered on the bolt. An outer peripheral side taper having a ring shape disposed on the upper side and having a tapered surface whose thickness gradually decreases from an outer peripheral edge toward an inner peripheral edge in a radial direction. And a plurality of arc-shaped pieces arranged concentrically around the bolt, the thickness gradually decreasing from the inner peripheral edge toward the outer peripheral edge in the radial direction, and the tapered surface of the tapered flange. A plurality of inner peripheral side taper flanges that contact, and a plurality of small bolts that penetrate radially from the outer peripheral side toward the inner peripheral side with respect to the outer peripheral side taper flange and are screwed to the respective inner peripheral side taper flanges. And a fastening device.